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AM3352B串口打印CCC问题?



我用3352BZCZ80A新做了一款产品,没有TF卡时,串口都是打印9个CCC后就停了,是不是应该不停打CCC,还是打几个就停了?跟之前产品的区别是,之前用的AM3352BZCZ100,不停打CCC。